3 881 Exponent Status

Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

TF

No factors below 2⁶⁶

TF target 2⁴⁴

TF below 2^217 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	216000000000
B2 =	1000182848193929400

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	640 / 640
35	1000000	1566 / 1566
40	3000000	4588 / 4588
45	11000000	9201 / 9201
50	44000000	16550 / 16550
55	110000000	40830 / 40830
60	260000000	105362 / 105362
65	800000000	194238 / 194238
70	2400000000	135530 / 350860

Estimated T-Level: 66.9 ⓘ

Status	Date	User	Residue	Shift
Verified		Unknown	3943	0
Verified		George Woltman	AF8B303619F03943	0
Verified		Brian J. Beesley	AF8B303619F03943	0
Verified	2015-04-11	MadPoo	AF8B303619F03943	887

Assigned

Assigned	User	Work Type	Stage	% Done	Updated	Expired
2025-02-01	Kamil Gorski	factor P-1 small	S1	73.86 %	2025-02-22

History

Date	User	Type	Result
2024-10-11	timc995	NF-PM1	B1=216000000000, B2=1000182848193929400
2024-10-11	timc995	NF-PM1	B1=216000000000, B2=300075563567920140
2023-08-13	masser	NF-PP1	Start=6/5, B1=2390000000, B2=427810000000
2023-07-11	masser	NF-PP1	Start=104/19, B1=2390000000, B2=95600000000
2023-07-07	masser	NF-PM1	B1=72000000000, B2=90401203222730400
2022-03-17	Anton Repko	NF	no factor from 2^65 to 2^66
2021-05-13	ATH	NF-PP1	Start=2/7, B1=1000000000, B2=241000000000
2021-01-30	Anton Repko	NF	no factor from 2^64 to 2^65
2018-05-08	snme2pm1	NF	no factor from 2^63 to 2^64
2016-11-29	snme2pm1	NF	no factor from 2^62 to 2^63
2016-02-23	LaurV	NF	no factor from 2^57 to 2^58
2015-07-31	snme2pm1	NF	no factor from 2^61 to 2^62
2015-04-11	MadPoo	C-LL	AF8B303619F03943
2012-09-29	bcp19	NF	no factor from 2^60 to 2^61
2012-08-16	BloodIce	NF-PM1	B1=200000000000, B2=2000000000000, E=12
2012-07-16	BloodIce	NF-PM1	B1=100000000000
2011-04-23	Joss	NF-PM1	B1=10000000000
2011-02-11	monst	NF	no factor from 2^58 to 2^60